I need to send an email to address the issue

HTTP Status 500 - Access Token not issued!!

type Status report

message Access Token not issued!!

description The server encountered an internal error that prevented it from fulfilling this request.

how to upgrade - how to proceed with  the upgrade. orginal version purchased elements 11 and now paid for upgrade and the email  link for upgrade download does not work. can someone give the email id to send the request .